diff --git a/reference/strings/functions/implode.xml b/reference/strings/functions/implode.xml
index d5d89eda40..23639ebf88 100644
--- a/reference/strings/functions/implode.xml
+++ b/reference/strings/functions/implode.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
   <refentry id="function.implode">
    <refnamediv>
@@ -13,7 +13,9 @@
       <methodparam choice="opt">
        <type>string</type><parameter>glue</parameter>
       </methodparam>
-      <methodparam><type>array</type><parameter>pieces</parameter></methodparam>
+      <methodparam choice="req">
+        <type>array</type><parameter>pieces</parameter>
+      </methodparam>
      </methodsynopsis>
     <para>
      Returns a string containing a string representation of all the